Quote Originally Posted by Graystroke
Just from a common sense stand point I would say at least half since everything is driven from the rotation and grip that the belt has on the crank pulley. I would just look at a bunch differnt vehicles w/ the same amount of engine driven accessories and see how the manufactures did it. Compare number of pulleys/accessories vs. HP vs. loads (size of acc) vs. contact area and take the avg. my 2 cents...
I think u should leave this up to an engineer Considering that the crank drives the system I would think that you would need at least 50% to be on the safe side of things. I am willing to bet it will slip.